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16.5.14 Outdoor High Pressure Abnormality (H64)
Malfunction Decision Conditions:
During operation of cooling and heating, when the outdoor high pressure sensor output signal is 0 Vdc or 5 Vdc.
Malfunction Caused:
1 Faulty
connector
connection.
2 Faulty
sensor.
3 Faulty outdoor unit PCB (main).
Abnormality Judgment:
Continue 4 times in 20 minutes.
Check the continuity of the outdoor unit PCB (main)
high pressure sensor connector CN-HPS:
- Plug out connector from the outdoor unit PCB (main)
- Measure the continuity pin 1 & 3 (GND) and pin 1 &
4 (5V) of CN-HPS
Yes
Yes
Check the CN-HPS connector connection:
- Turn OFF the power
- Check the connector connection
- Connector poor contact
- Correct the connection
No
Is the CN-HPS connector
connection normal?
No
Is there any continuity?
Reconnect the high pressure sensor
connector to the outdoor unit PCB
(main). Turn ON the power and run the
system. Measure the DC voltage pin 1
& 3 (GND) of CN-HPS.
Is the measured voltage
0Vdc or 5Vdc?
- Defect in outdoor unit
PCB (main)
- Replace the outdoor
unit PCB (main)
- Defect in outdoor high
pressure sensor
- Replace the outdoor
high pressure sensor
Yes
No
- Defect in outdoor unit
PCB (main)
- Replace the outdoor
unit PCB (main)
Troubleshooting:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
Caution